Power-shovel



c, A. PRATT. Powkss sHovEL. APFL|CAT-ION FILD JUNE Q 1913 RENEWED OCT.l0. l9l9.

1,340,498, Patented May 18, 1920.

4 SHEETS-SHEET l.

vii

6'6"" 64,' C2 if C f (w3/'h f c. A. PRATT.l POWER SHOVEL.

APPLICATION FILED JUNE 9| 1913l RENEWED OCT. 10, 1919.

Patented May 18, 1920.

4 SHEETS-SHEET 2- C. A.I PRATT.

POWER SHOVEL.

RENEWED OCT. 10.1'919.

APPLICATIQN'FILED JUNE 9.1913.

Patented May 18, 1920.

4 SHEETS-SHEET 3.

C. A. PRATT.

POWER SHOVEL.

APPLICATION FILED JUNE 9.1913. RENEWED OCT. l0, i919.

1,340,498. Patented May18, 192

4 SHEETS-SHEET 4- Me @Se e 17T/@wr 9712- g4 fg l /QWg/S" UNITED sTATEsPATENT oEEioE.

CHARLES A. PRATT, OF CHICAGO, ILLINOIS, ASSIGNOR TO GOODMANMANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

POWER-SHOVEL.

Specification of Letters Patent.

Patented May 18, 1920.

Application led .Tune 9, 1913, Serial No. 772,521. Renewed Cetober 10,1919. Serial No. 329,889.

To all whom t may concern Be it known that I, CHARLES A. PRATT, acitizen of the United States, residing at Chicago, in the county of Cookand State of Illinois, have invented a certain new and usefulImprovement in Power-Shovels, of

which the following isa specification.

This invention relates to power driven shovels for handling bulkmaterial such as coal, broken stone and the like and has for its objectto provide a device for depositing it into cars or other receivers.

The invention is illustrated in the accompanying drawings wherein-Figure 1 is a plan view with parts broken away, illustrating one form ofthe power shovel as is used in a. mine for shoveling loose coalintocars;

Fig. 2 is a side elevation in part section showing one form of thedevice;

Fig. 3 is an enlarged plan view; v

Fig. 4 is a side view of the shovel beam;

Fig. 5 is a plan view of the shovel beam;

Fig. 6 is a cross-sectional view through the shovel beam;

Fig. 7 is a sectional view taken on line 7--7 of Fig. 3.

Like partsare indicated by like letters throughout the several figures.

For the purpose of illustration I have shown the power shovel in use inamine for the purpose of shoveling the coal into cars after it has beenshot down, so that it can be hauled away.

As herein illustrated, the power shovel consists of three principalgroups of parts, viz: a base A, a turntable B, and a shovel C. The baseis held firmly in place by any suitable arrangement of jacks. In Fig. l,two sets of jacks are shown, each set consisting of two jacks indiagonally opposite corners. Jacks A1 are used when loading car 1, andjacks A2 are used when loading car 2. The base A carries a pivot A3 uponwhich the turntable B is centered. It also carries a circular rack A4twith which pinions B1 and B2 mesh. These pinions are mounted on the turntable and are supplied with power, thus providing a means for revolv-lin the turntable with reference to the base.

ase A also carries acircle of rollers for supporting the weight of theturntable, shovel and load. These rollers, A5, are suitably coned towardthe center of the pivot A5. They revolve on studs A6 carried between aninner ring A7 and an outer ring A11. The circle of rollers travels in arace-4 way in the base, which keeps it concentric with the pivot.

Base A also carries rollers A5, which serve to prevent the turntablefrom tipping when the loaded shovel is being raised.

The turntable B carries the power mechanism for revolving itself, andfor actuating the shovel. The shovel, by this mechanism, is given motionin a horizontal plane, outward from the center of the turntable orbackward toward the center; it is also given motion in a vertical plane,revolving around the center of shaft B5. The turntable also carries fourguides B1 which serve to guide the shovel beam.

The power mechanism carried on the turntable, consists of a motor, airengine or other source of power, with speed reducing gearing necessaryto drive shaft B5 at the proper speed.

B5 carries a pinion BG which meshes with Gear B7, which in turn mesheswith gear B5. irear B7 drives shaft B1 and gear BE1 drives shaft B10,and these shafts revolve in opposite directions. Gears B11 and B12 aremounted on sleeves on shafts B9 'and B10, and are driven by these shaftsthrough the friction clutches B13 and B11; the shifting mechanism B15being so arranged that when B11 is driven, B12 revolves loosely on shaftB10, and vice versa, the shifting lever alsohaving a central position inwhich neither B11 or B12 is driven. Gears B11 and B12 both mesh withgear B15, -which drives shaft B5. Shaft B3 drives gear B15, which mesheswith the rack CJl on the shovel beam and drives the shovel. Sinceshifting mechanism B15 controls the direction in which shaft B3revolves, it also controls the motion, backward or forward of theshovel.

Keyed to shaft B9 is a sprocket wheel B17 which through a sprocket chaindrives sprocket B11. Keyed to shaft B10 is a sprocket wheel B15 whichthrough a sprocket chain drives sprocket B20. Sprocket wheels B10 andB20 revolve in opposite directions and both are mounted on sleeves onshaft B23 and this shaft may be driven by either of these sprocketsthrough friction clutches B21 or B22. The friction clutch lshiftingmechanism B21, therefor, controls the direction in which shaft B25revolves, or B2* ma be set in a central position in which sha B23isundriven Keyed to shaft B23 is a friction brake pulley, B25 and theband brake encircling this pulley is controlled by hand wheel B23. Keyedto shaft B23 is a wire rope drum B27. On this drum is wound a wire ropeB23, which is anchored at its center to the drum. One end is carriedunder sheave B23, and attached to one end of the shovel cradle and theother end of B28 is carried under sheave B30 and attached to the otherend of the shovel cradle. By rotating shaft B23 in one direction or theother, by means of the control given by shifting lever B24, the wirerope is wound in one direction onth'e other and thus .the shovel israised or lowered. By means: of friction' brake B25, the shovelmaybejheld at any elevation. y A

Mounted on the sleeve onv'shaft B9, is bevel pinion B31 and this may bedriven by shaft B3 through friction clilt'ch B33. Bevel pinion B31drives bevel gear B35 which drives `vertical shaft B37 to the lower endof which is i keyed pinion B1, which meshes- Awith rack A4 and revolvesthe turntable.

Mounted on a sleeve on shaft B10 is bevel inion B32 and this may bedriven by shaft 1, through friction clutch B32.

Bevel pinion B32 drives bevel gear B33 which drives vertical shaft B3Bto the lower end of which is keyed pinion B2, which `controlled by onelever B33, which in one position engages clutch B33, in another positionengages 3* and in a central positlon ,does not engage either.

Journaled on the shaft BSE` is the shovel cradle. This consists. of twosimilar and parallel arms B20, one on either side of the shovel beam.These" two Aarms are joined together at one end by a cross piece B41,which asses below the shovel beam, and to which 1s attached one end ofwire cable B23, and they are joined together at the other end by thecross piece B22 which passes below the` shovel beam and towhich isattached the other end of the cable B22. The arms arealso joined at thisend by a cross piece Bf, which passes over the shovel beam` The shovelconsists of the scoop, the beam l and the ejector. The beam as shown inFi s. 4, 5 and 6 is made of structural mate-l ria and must besufficiently strong to raise the weight of material lifted by the scoop.

cars.

Fig. 6 shows a cross section of the beam which consists of ltwo sidemembers, C1 joined together by a top member C2 and an inner member C3.Attached to the lower side of C3 is the rack C4 by means of which gearB43 drives the shovel. At each side of the rack teeth is a bearingsurface C3, which is at the level of the pitch line of the rack teethand on which the weight of the shovel and the material is carried. GearB43-is provided with corresponding surfaces B? on its pitch circle. Thecradle rollers B24 run on the flanges C3. The shovel beam terminates inthe casting C7 which carries the scoop on the trunnions C3. The bracketsC2 provide a support for the scoop latch C10 and may be of any desireddimensions. The scoop as shown is made of boilerplate or any othersuitable material. It is strengthened and supported at the inner end bya member Clll which crosses the top of the scoop and extends down bothsides to the trunnions C3. C11 carries the catch C12 with which thelatch C110 engages. The latch C1o is opened by pulling the rope C13which passes back along the shovel beam and is attached to it at C14.There is attached to the outer end of the scoop, a shoe C15 which hangson pivot C13, and fori'ns a support for the end the scoop has six sidesand that two of itsA sides are open, viz: the forward side and the top.

Fig. l shows the power shovel set and jacked in place suitably forloading into two If the material is to be loaded into one car, the frontjacks would have to be set far enough back to permit the shovel beam toswing in both directions far enough to reach the material, and in onedirection far enough to reach the car. The rear jacks also would have tobe set far enough out and back to give the necessary freedomgof motionto the tail end'of the shovel beam. This would result in greater widthof base than would otherwise be necessary.

The shaft B5 carries a capstan B47 on outer end. This, in conjunctionwith sheaves located as at B42, and a rope an; chored to a jack, is foruse in moving the power shovel from place to place and in loading it onto its transporting truck. The transporting truck may be similar to amining machine truck and arranged fori power drive from the shovelmotor. e

Theuse and operation of my invention are as follows When the device isused in a coal mineb .fbr example, as shown in 1, and it is desired toload car 1, the shovel is broughtl vinto proximityto thecoal to behandled and the jacks A1 at oppositecorners thereof are Jacks engagingthe roof or some fixed part sition so as to leave the shovel and beamfree to move without striking the jacks The scoop C is then moved downto the ioor and moved forward under the coal byrevolving the shaft B3.After sufficient coal is on the scoop, the shaft B3 is stopped, the

`rotation of said shaft being controlled by the lever B15. The shaft B23is now rotated so that the cable B28 will be moved to pull down the rearend of the cradle and lift the scoop. Vhen the scoop has been lifted,the rotation of the shaft is stopped, said rotation being controlled bythe lever B24. The turntable B is then rotated by rotating the `ShaftB37 or shaft B38 depending upon which car is to be loaded. This rotationmoves the scoop toward the car, as for example, car 1. lVhen the scoopgets opposite the car or above the car if the scoop is far enoughforward, the rotation of the turntable is stopped. If the scoop is notfar enough forward to be'above the car, the shaft B3 is rotated so as tocause the gear B49 to rotate and since said sprocket is in engagement'with the rack 0*, the scoop .will be moved forward. When in properposition above the car, the rotation of the shaft B3 is stopped. Therope or cable C13 is now pulled so as to disengage the latch C1 from themember C12. The weight of the coal now causes the scoop to drop, saidscoop moving about the pivotal connection C8 so as to discharge the coalinto the car. If for any reason there is not room to permit the scoop todrop, the latchl C10 is left in position and the bolt C20 loosened so asto unclamp the rod C18. The bolt B40 is tightened so as to clamp saidrod to the cradle B4. The shaft B3 is now rotated in the oppositedirection so as to move the scoop toward the shaft B3. The ejector C17fastened to the rod C S is now held against movement and the saidvejector strikes the coal as the scoop is moved backward and dischargesit from the scoop.

It will be seen that by means of this device, material in bulk, such ascoal', stone, sand or the like may be easily and quickly handled inlarge quantities, and may be moved from one place to another and loweredinto vehicles or handledV for any other purpose desired.

I claim:

l. A power shovel comprising a base, a turn-table mounted thereon, ashaft mounted on said turn-table, a rocking member mounted on saidshaft, a supporting beam slidably connected with said rocking member, ascoop connected with said supporting beam, power actuated meansconnected directly with said rocking member at separated points onopposite sides of said shaft for moving said rocking member to move saidsupporting beam to lift the scoop, said shaft, rocking member andpower-actuated means being located below the top of said supportingbeam, a rack on said supporting beam. and a toothed wheel on said shaftengaging said rack, said rocking member and toothed wheel moving aboutthe same axis.

2: A power shovel comprising a base, a turn-table mounted thereon, ashaft mounted on said turn-table, a rocking member mounted on saidshaft, a supporting beam slidably connected with said rocking member, ascoop connected with said supporting beam, a flexible power-transmittingdevice connected directly with two parts of said rocking member onopposite sides of said shaft, direction-changing devices for saidflexible power-transmitting device located substantially in verticalalineinent with the parts of said rocking member to which the saidiexible power-transmitting device is connected,`

said shaft, rocking member, flexible powertransmitting device anddirectioirchanging devices being located below the top of saidsupporting beam, a. rack on said supporting beam and a toothed wheel onsaid shaft engaging said rack, said rocking member and toothed wheelmoving about the same axis.

3. A power shovel comprising a base, a turn-table mounted thereon, ashaft mounted on said turn-table, a rocking member mounted on saidshaft, a supporting beam, a scoop carried by said supporting beam, saidrocking member comprising two side pieces one on each side of the centerline of said supporting beam, separated cross-pieces extending undersaid supporting beam and rigidly connecting said side pieces and uponwhich said supporting beam rests and slides, power driven means foi'sliding said .supporting beam along said cross-pieces, power-actuatedmeans connected directly with said rocking member at separated points onopposite sides of said shaft foi' moving said rocking member to movesaid supporting beam to lift the scoop, said shaft, rocking member andpower-actuated means being located below the top of said supportingbeam, and means for transmitting the weight of said supporting beam andscoop directly to said shaft so as to remove weight from said rockingmember to facilitate the easy sliding of said supporting beam on saidcross-pieces.

e In testimony whereof, I atlix my signature in the presence of twowitnesses this 21st day of May 1913.

CHARLES A. PRATT.

Witnesses:

SIDNEY G. LATHRor, JANIE M. KING.

